On prevailing wage projects, employees are paid for the different trade work they do by the rate for that trade.  Sometimes, employees work in more than one classification (e.g. Carpenter and Laborer).  These lines of demarcations are tricky sometimes, especially in situations where work in one trade might follow closely on the work of another. 

Where a plaintiff files a FLSA (or other statutory wage hour) lawsuit, he may well file state law, tort-like claims, such as unjust enrichment, breach of contract, fraud and others. Usually, if not always, those claims/counts are predicated upon and solely arise from the alleged FLSA violations. As such, the FLSA (or any other wage